On a day when a fierce blizzard lashes at your face, you step into a dreamlike ice castle located atop a high snowy mountain. A small presence can be heard from within the castle.

From behind a pillar, a blue-haired brat in pajamas comes trudging out, dragging her tail lazily behind her.

The blue brat immediately runs away. From a distance, loud clattering sounds can be heard as if she is hurriedly grooming herself.

A moment later...